SIG Sauer Fuse 9mm 5.1" 21-Round Threaded Barrel

The SIG Sauer Fuse 9mm 5.1" 21-Round Threaded Barrel delivers next-generation concealed-carry capability for operators who demand enhanced capacity without sacrificing concealability. Purpose-built for tactical professionals, law enforcement, and civilian defenders, this platform combines SIG's proven reliability with the flexibility of a threaded barrel for suppressor integration or muzzle device installation. The 21-round magazine capacity paired with the compact 5.1" profile makes this configuration ideal for duty carry, personal defense, or transition training where round count matters.

Engineering-grade design is the cornerstone of this platform. The threaded barrel—machined to standard 1/2x28 pitch specifications—accepts industry-standard suppressors, compensators, or flash hiders without modification, enabling users to tailor muzzle behavior to mission requirements. The 5.1" barrel length optimizes sight radius and dwell time for consistent terminal performance while maintaining the proven SIG P365 ergonomics that have set the concealed-carry standard across law enforcement and military communities. The 21-round magazine capacity extends defensive capability significantly over standard single-stack platforms, and the flat-bottom design seats flush for minimal printing while offering substantial round-count advantage in critical-incident scenarios.

This configuration suits duty officers seeking suppressor-ready platforms, advanced civilian defenders prioritizing magazine capacity, and training professionals building versatile duty systems. The threaded barrel integrates seamlessly with common tactical accessories—standard suppressors, recoil management devices, and muzzle brakes—without secondary modifications or adapter sleeves. Compatibility with the proven SIG P365 ecosystem ensures access to a full range of holsters, night sights, and upgrade components. Weight remains user-manageable at 1 lb, preserving the concealability advantage that defines the platform while delivering the firepower users expect from modern defensive tools.